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March 6,1928 Re. 16,894

. 'AR'BRUSH .INTERNAL C OMBUSTION ENGINE Original Filed Feb. 191a WWW MW 6 attoznmgs 7221 21.90)? Bra 5)? UNI ED-stares v Rs. 16,894 PATENT j-O'FFICE.

ALAnsoN r. BB'USHQOF DETROIT, mronxean, ASSIGNORTO THE sImPLax rrsron nme co. or summon, me, or CLEVELAND, 0310, a conronarronor pure.

INTERNALTCOMBUSTION ENGINE. i

Original No. 1,299,674, dated April 8, 1919, SerialNo. 217,652 filed February 1c, 1918. i reissue filed August 29, 1927. Serial No. 216,323.

' This invention relates to a certain new and useful improvement in internal comhustion engines, of which f't lie :tollowing is a full, clear, and exact description.

5 The object of this invention is to pre vent what is called piston slap in internal combustion en 'nes. In such engines there must-be cons'i erable workingclearance between the piston and the cylinder in order that the piston may operate properly there- The pressure on the piston and the 1n. reversal of angularity of the connecting rod causes such pistons to press first aga nst one side of-the cylinder and then aga nst 16 the other side diametrically across the cylinder at right angles to the axis of the'plston wrist pin.- Of course, the movement 'of the piston is small; but nevertheless, in many engines, when the piston reversesits 20 motion, it, moves this short distance very rapidly, and in a substantially straight path at ri ht angles to the axis 0 the wrist pm, which connects'the connecting rod with the piston; and "the result is that the piston,

when itcomes against the opposite side of the cylinder, makes a noise which-1s known,

as iston slap,

he present I istoninmoving from one s1de of the cyllnder to the other to move,. not in the straight path at right angles to said con necting rod pin, but in. a curved path so thatthe'line of contact'between the piston and the cylinder movesgaround the cylin- 'drical wall of the cylinder from one side thereof to'the "other. To efiect this result according to this invention one employs means for yieldingly pressing the piston at all-times lengthwise ofithe piston wrist 40 pin and toward one end thereof.

' The invention consists in-the construction and combination of parts shown in the drawings and hereinafter described and pointed 'nvention aims to cause the plan view in the usual operative clearance. 16. represents the A plication for wristpin carried by the piston, and20 the connecting rod whose-lower end is journaled on the crank pin 22 of ;;the crank shaft 23,

and Whose upper endisY'ournaled, on the wrist pin 16. To cnableiite, istoii to move in the desired circular path, tliegpiston must be permitted a short inovement-ijlengthwisc of said wristtpin relative tothef connecting rod.. To permit such movement there must be sufiicient clearance between the piston and the ends of the connecting rod bear- 'ing 21 and the pin must be capable of mov- 111g endwise relatively to either the piston or connecting rod.

The p ston is formed with the'usual annnlar grooves 17 and these contain the usual metallic split spring piston rings 22 and 23.

In order to impart to the'piston the yielding pressure lengthwise of the wrist pin 16 required toproduce the desired result, I

prefer to utilize the lower piston ring 23- and to employ,iin connection with it, two,

coil springs .19, set in suitable recesses 24 in the sideoli the piston behind the-lower piston ring, one on each side of but fairly close to the axis of the wrist pin. The resultant action of these two s'prin s is to yieldingly .push the piston in the irection of the wrist pm and toward the opposite end thereof, to that to which said coil are adjacent. These springs are not strong enough to overcome the combined actionflof,

the pressure on the piston and the angupiston to contact first with one side-and then springs with the other side of the cylinder. But

they are strong enough to and do actat the instant when the piston is ateither end of its stroke, and the ang-ula-rity of the connecting rod is changing to push the piston lengthwise of the wrist pin. The result'of this action will he that the piston, instead otmoving directly across the cylinder in a path at righ't'angles to the wrist pin, such, for example, as indicated by the straight double arrow 30 in Figure 1, it will move in substantially the. path indicated by the curved double arrow 3=1' on'Figure 1, said piston substantially maintaining a contact with the innerwall of the cylinder from one side thereof: to. the other. Of course, this prevents. the noise which is, as liefore stated, known as piston slap.

air

' which pivotally connects the connecting rod with the piston, said piston having a. circumferentially extending groove therein ad acent said wrist pin, a member radially movable in said groove peripherally bearing against the cylinder wall and resilient means between j sa id member and piston yielding'ly' tending to push the piston across the cyllnder in one direction of the length of said connecting rod pin.

2. In an engine, the combination of a. cylinder, a piston therein having operatlve clearance, a connecting rod, a Wrist pin which pivotally connects the connecting rod with the piston, sud piston having annular piston ring grooves, one of WlllCll 1s ad acent the wrist pin, piston rings in said grooves and? springor springs adjacent one end of the wrist pin acting to push thepiston ring against the adjacent surfaceof the cylinder and a piston in the opposite direction lengthwise of the wrist pin.

In testimony whereof I affix mysignature.

ALANSON P. BRUSH. 

